From mboxrd@z Thu Jan 1 00:00:00 1970 From: Abhishek Sahu Subject: [PATCH v2 1/3] dmaengine: add DMA_PREP_CMD for non-Data descriptors. Date: Mon, 26 Jun 2017 18:19:27 +0530 Message-ID: <1498481369-29497-2-git-send-email-absahu@codeaurora.org> References: <1498481369-29497-1-git-send-email-absahu@codeaurora.org> Return-path: In-Reply-To: <1498481369-29497-1-git-send-email-absahu@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org To: andy.gross@linaro.org, david.brown@linaro.org, vinod.koul@intel.com, dan.j.williams@intel.com Cc: linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, Abhishek Sahu List-Id: linux-arm-msm@vger.kernel.org Some of the DMA controllers are capable of issuing the commands to peripheral by the DMA. These commands can be list of register reads/writes and its different from normal data reads/writes. This patch adds new flag DMA_PREP_CMD in DMA API which tells the driver that the data passed to DMA API is in command format and DMA driver will form descriptor in the required format. This flag can be used by any DMA controller driver which requires special handling for non-Data descriptors. Signed-off-by: Abhishek Sahu --- include/linux/dmaengine.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 5336808..bbc297e 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -186,6 +186,8 @@ struct dma_interleaved_template { * on the result of this operation * @DMA_CTRL_REUSE: client can reuse the descriptor and submit again till * cleared or freed + * @DMA_PREP_CMD: tell the driver that the data passed to DMA API is in command + * format and it will be used for configuring the peripheral registers. */ enum dma_ctrl_flags { DMA_PREP_INTERRUPT = (1 << 0), @@ -195,6 +197,7 @@ enum dma_ctrl_flags { DMA_PREP_CONTINUE = (1 << 4), DMA_PREP_FENCE = (1 << 5), DMA_CTRL_REUSE = (1 << 6), + DMA_PREP_CMD = (1 << 7), }; /** -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation